System for monitoring dialled telephone numbers

Details System for monitoring dialled telephone numbers System for monitoring dialled telephone numbers

1974-11-08

1977-03-22

Claffy, Kathleen H.

179 1MN, 179 90AN, H04M 1506

Patent

active

040138399

ABSTRACT:
A system for monitoring dialled numbers is disclosed which provides a subscriber with a record of numbers dialled over his telephone line or lines. The system provides a monitoring unit inductively coupled to each line which tapes the dial pulses as they are dialled. Aslo included is a control processing unit which processes the individual tapes to provide a written record. The system thus eliminates the need for duplicating costly equipment such as discriminators and printers at each line.

REFERENCES:
patent: 3495229 (1970-02-01), Ruehwle
patent: 3674941 (1972-07-01), Guetta
patent: 3844512 (1974-10-01), Fahzewberg

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